<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!--径向渐变 圆型渐变-->
    <style>
    body{
        background-image: linear-gradient(19deg,#21D4FD 0%,#B721FF 100%);
    }
    </style>
</head>
<body>
哈哈哈哈
</body>
</html>